diff --git a/api/bases/keystone.openstack.org_keystoneapis.yaml b/api/bases/keystone.openstack.org_keystoneapis.yaml
index bf3eb1bb..7e725f5e 100644
--- a/api/bases/keystone.openstack.org_keystoneapis.yaml
+++ b/api/bases/keystone.openstack.org_keystoneapis.yaml
@@ -1154,6 +1154,7 @@ spec:
                         - volumes
                         type: object
                       type: array
+                      x-kubernetes-list-type: atomic
                     name:
                       type: string
                     region:
diff --git a/api/v1beta1/keystoneapi_types.go b/api/v1beta1/keystoneapi_types.go
index ca0509eb..fd8b670b 100644
--- a/api/v1beta1/keystoneapi_types.go
+++ b/api/v1beta1/keystoneapi_types.go
@@ -26,9 +26,9 @@ import (
 	"github.com/openstack-k8s-operators/lib-common/modules/common/tls"
 	"github.com/openstack-k8s-operators/lib-common/modules/common/util"
 	"github.com/openstack-k8s-operators/lib-common/modules/storage"
-	"k8s.io/apimachinery/pkg/util/validation/field"
 	corev1 "k8s.io/api/core/v1"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"k8s.io/apimachinery/pkg/util/validation/field"
 )
 
 const (
@@ -347,6 +347,7 @@ type KeystoneExtraMounts struct {
 	// +kubebuilder:validation:Optional
 	Region string `json:"region,omitempty"`
 	// +kubebuilder:validation:Required
+	// +listType=atomic
 	VolMounts []storage.VolMounts `json:"extraVol"`
 }
 
diff --git a/config/crd/bases/keystone.openstack.org_keystoneapis.yaml b/config/crd/bases/keystone.openstack.org_keystoneapis.yaml
index bf3eb1bb..7e725f5e 100644
--- a/config/crd/bases/keystone.openstack.org_keystoneapis.yaml
+++ b/config/crd/bases/keystone.openstack.org_keystoneapis.yaml
@@ -1154,6 +1154,7 @@ spec:
                         - volumes
                         type: object
                       type: array
+                      x-kubernetes-list-type: atomic
                     name:
                       type: string
                     region: